Component	Description
Geological Layer	Thermal erosion simulation
Ecological Layer	9 biome types with spreading rules
Feedback Loop	Forests stabilize terrain (80% resistance)
Renderer	2.5D isometric with atmospheric fog

Cellular Automata Rules

Thermal Erosion

Physical Process: mass flows downhill if slope > threshold

if (h - neighborH > threshold) {
    // Transfer mass downhill
    newHeight = h - erosionRate;
}

Coupling: Biomes modify physical parameters

if (biome == FOREST) 
    erosionRate *= 0.2; 
    // 80% reduction

Stochastic CA: Random transitions based on neighbors

if (isGrass && forestNeighbors >= 3) {
    if (random() < 0.3) 
        convertToList(FOREST);
}

Biome	Behavior
Water	Height < 0.3 (forced)
Sand	Coastal zones
Grass	Default land, converts to forest
Forest	Spreads, resists erosion
Desert	Spreads in dry areas
Rock	High elevation (>0.8)
Snow	Peaks (>0.85)
Tundra	Alpine transition
Wetland	Low areas near water